Hybrid Unicast/Multicast DNS-Based Service Discovery
draft-cheshire-dnssd-hybrid-00

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Document Type Active Internet-Draft (individual)
Last updated 2013-10-21
Replaces draft-cheshire-mdnsext-hybrid
Replaced by draft-ietf-dnssd-hybrid
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Internet Engineering Task Force                              S. Cheshire
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                            Oct 21, 2013
Expires: April 24, 2014

          Hybrid Unicast/Multicast DNS-Based Service Discovery
                     draft-cheshire-dnssd-hybrid-00

Abstract

   Performing DNS-Based Service Discovery using purely link-local
   Multicast DNS enables discovery of services that are on the local
   link, but not (without some kind of proxy or similar special support)
   of services that are outside the local link.  Using a very large
   local link with thousands of hosts improves service discovery, but at
   the cost of large amounts of multicast traffic.

   Performing DNS-Based Service Discovery using purely Unicast DNS is
   more efficient, but requires configuration of DNS Update keys on the
   devices offering the services, which can be onerous for simple
   devices like printers and network cameras.

   Hence a compromise is needed, that provides easy service discovery
   without requiring either large amounts of multicast traffic or
   onerous configuration.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 24, 2014.

Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Internet-Draft     Hybrid uDNS/mDNS Service Discovery           Oct 2013

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions and Terminology Used in this Document . . . . . . . 3
   3.  Hybrid Proxy Operation  . . . . . . . . . . . . . . . . . . . . 4
   4.  Implementation Status . . . . . . . . . . . . . . . . . . . . . 6
   5.  IPv6 Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 8
   7.  Intelectual Property Rights . . . . . . . . . . . . . . . . . . 8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     10.1.  Normative References . . . . . . . . . . . . . . . . . . . 8
     10.2.  Informative References . . . . . . . . . . . . . . . . . . 9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 9

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Internet-Draft     Hybrid uDNS/mDNS Service Discovery           Oct 2013

1.  Introduction

   Multicast DNS [RFC6762] and its companion technology DNS-based
   Service Discovery [RFC6763] were created to provide IP networking
   with the ease-of-use and autoconfiguration for which AppleTalk was
   well known [RFC6760] [ZC].

   Section 10 ("Populating the DNS with Information") of the DNS-SD
   specification [RFC6763] discusses possible ways that a service's PTR,
   SRV, TXT and address records can make their way into the DNS
   namespace, including manual zone file configuration [RFC1034]
   [RFC1035], DNS Update [RFC2136] [RFC3007] and proxies.

   This document specifies a type of proxy called a Hybrid Proxy that
   uses Multicast DNS [RFC6762] to discover Multicast DNS records on its
   local link, and makes corresponding DNS records visible in the
   Unicast DNS namespace.

2.  Conventions and Terminology Used in this Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   "Key words for use in RFCs to Indicate Requirement Levels" [RFC2119].
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